Pumping device



N. WENER.

PUMPING DEVICE.

APPLICATION FILED JUNE 11. 1918.

Patented Sept. 14, 1920;

three pairs of receptacles is similar.

UNITE nrLs WENER, or strocKHoLivi, swsnnn, Assrsnon T0 SVENSKA AKTIEBOLAGET Mono.

' PUMPING DEVICE. i

To all whom it may. concern: v 1

Be it known that I, NILs WENER, subject of the King of Sweden, residing at 11 Upp'- salagatan, Stockholm, Sweden, h'ave-inventad certain new and useful Improvements in Pumping Devices, of which the following is a specification.

v The present invention relates to a pumping device with an oscillating liquid-piston,

which is-especiallysuitable for the opera-c tion of gas-analyzing apparatus.

In German patent No. 226,542 there is described a liquid-piston pump, adapted to operate by either pressure or suction, and comprising two receptacles,communicatmg with each other, and areturnpipe forthe pumping liquid, arranged in a branch from either the outlet or inlet pipe of the pressure exhaust or inlet pipe. If this pump is, for instance, employed as agas-analyz: ing apparatus, by means of which two d1fferent. analyses are alternately performed, several difficulties will arise. In order to avoid these difiiculties in a simplemanner, the pump, according to thejpresent invention, is constructed as a duplex pump, triplex pump, and so forth, in such a manner that at each pumping stroke'a small quantity of the pump'liquid isc'onducted from one pump to another by the return pipe leading from one pump to the other. The overflowing quantity of liquid is thereby so large that that pump, from which this quan-- tity flows, can no longer work, while "that quantity will be to B from A to B and from A to B The arrangement for a duplex pump or for pumps provided with more tlllitln e pumps can, however,"also be connected in another manner, namely, by means of an overflow pipe, through which the said small quantity of liquid-willfiowat each strolre. In such an arrangement the pumps Wlll be operated automatically and alternately, so that the measuring receptacles of the analyzing. apparatuses connected -with the ump, the three return pipes lead I I .Sp ecificationof Letters Patent. Patented ,5 1920 Application'filed June 17, 1918.

Serial No. 240,541.

pumps also may receivefthe action as des1red.'

Some embodiments of the invention suitable for a gas-analyzing apparatus are schematically shown in the accompanying Figure 1 showing diagrammatically in elevation one form of such apparatus, and Figs. 2 and 3 showing in similar'view two other forms. V

'In Fig. 1, a a indicate the supply piping for the pressure agent, as,for instance, compressedair, drlvlngthe pumps, the air be tacles b and b lnto these receptacles (Z and (P, which are connected by means of the pipings a and the stand-pipes? and e? reach almost to. the bottom. The upper ends. of thestand-pipes open in'to'receptacles f and f? and from these receptacles the return pipes g and g are conducted to the pipings otyandc To these pipings c and of the common stand-pipes and measuring receptacles are connected in a manner known in gas-analyzingapparatus; The latter are, as well as the-supply and exhaust pipings of the measuring receptacles M and M schematically shown in the drawing. i

1 The action ofreceptacles i and M similar to that of. the like device in U. .:S. Patent N 0. 947,533. Wh'enlliquid" from the pump rises in the said receptacles, the gas" isplresse d therefrom through' the pipes leadi'ng to the right, from the liquid seals above the receptacles. When, on' the other hand, the liquidfalls in said receptacles, fresh gas is sucked in through the pipescomingl from the left and emptying in said .water seals. This is the usual action in most gas analyzing apparatuses, where'afalling and rising" liquid is used for filling and emptying the first measuring receptacles.- 1

The mode of operation of the device is as follows: Assume that one of the receptacles (Z or d (Fig.1 1) contains so little'mercury that it cannot be put in action. (Z may, for

example, containsuch a small quantity of mercury that the lowervend of the standpipe 0? will not be submerged, and consequently, the air issuing from pipe at will escape'through 6 f to atmosphere without exerting pressure downwardly on the surface of mercury in Z2 The second receptacle is assumed to be filled with mercury to a normal extent, that is, to a depth at which the lower end of pipe 6 will be submerged. The pressure-agent flows constantly in the piping a and 64 but through (E, (Z and e flows off into the open air and. therefore exercises no action upon the pumping device. In the receptacle 0Z ,on the contrary, the pressure-agent presses upon the surface of the mercury in Z2 and (Z which communicate with each other, so that the mercu'ry will: be partially forced'out of the re- The colceptacle '6 into the piping c umns of liquid in pipes. 72, 29 0 connected with this piping 0 will. therefore rise. The gas mixture in M which is to be analyzed, will be forced out through the trap or valve m and pipe n tothe analyzing receptacle (not shown). While the action just described is taking place, liquid from d rises in the stand-pipe e and is a next rises.

eventually forced out through the upper end of 6 into 7. Thereupon, a reversal of the action takes place. The mercury, forced up through 0 will find its way from f through to the other side of the system, comprising 0 b 0 19 72, The spaces above the mercury in the two receptacles b and d 'will now be in communication with.

the atmosphere through the pipe 6 the pressure will drop to that of the atmosphere and the liquid will sink in all pipes and receptacles which are connected with the piping 0 flowing backto the receptacle 6?. As

' the column of mercury in pipe 0 and measuring' receptacle lVl falls, a quantity of gas will be drawn into M through pipe K to be expelled through a when the column As a small quantity of mercury has been transferred from the pump P to the pump P the quantity of mercury in b can no longer reach the opening in. the side wall of the receptacle CF, and therefore there will be an insuflicientquantity of mercury in. (Z to submerge the lower end of the .pipe 0 hence the pressure-agent issuing from a will merely pass to atmosphere through 6 f and pump P Wlll be lnactlve' for the time being.

. In the meantime, the pump. P has been rendered active because of the small quantity of mercury transferred from P to P the surface of the mercury in the receptacle 72 having been therebyraisedso that mercury may fiowin through the opening in the side wall of the receptacle 0Z quantity of liquid flowing in will form a liquid seal for the lower end of'the stand pipe 6 and now the pump P is ready for action and will 'work in the manner de-v scribed above with reference to the pump P ing, P is out of action, and vice versa.

The result is, of course, thatthe: measuring receptacles l and M are alternately emptied and the, gas tests disclosed therein'will be alternately expelled fromthe receptacles M and M in order to effect the analysis.

In the device above described, afurther inconvenience has appeared, as -1t1s not possible to build the different: receptacles.

and; pipings in such a manner that the quantity of the liquid transferredfrom P to.

P will always exactly correspond to the amount transferred from: P to. P

direction, so that eventually the pumping device will fail to function in the manner desired.

This inconvenience can be easily eli minated by having the pipings. c and 0 con-' nected with two stand-pipes, communicating" with each. other by an overflow piping;

This piping is V-formed and the pointof the pipingarranged .at such a height, that durmg normalworking of the pumps,.no.l-iquid is transmitted from one pipe systemto another. Should, however, one pump deliver more liquid. than it holdsback,an equaliza- The. v

If a differencedoes exist, the discrepancy wlli. not be equalized, but w1ll-.always go 1n, one

tion then.- will, take place through the over-- flow piping.

The alternating work of the two pumps is so. arranged that a small quantity of pump liquid is at every second stroke brought to pass from the pump; systemeb c (Z3 P, g to the other system 6 ,6 (5 6 f 51 andat every second stroke the said small liquid quantity is brought to flow from the, last-named systemback-toithe firstnamed system. 'Now, it can: of course v occur that thissmall liquid. quantity is not the same. at every stroke; the .f-ELLlltf could, be

such that always the quantity from the-system 1' to the system Qis a littlelgreatenthan the quantity from the system 2: tot the'sys: tem; 1. Then, of' course, after onlyya. few

strokes, the device would ceaseto= work. In:

order toavoid this, an overflow iis arranged,

which is so situated that when normal. con

ditions occur, the top point of the said overflow is just reachedby the liquid when it turns from the rising movement to the fall'- ing One. Should, however, at any stroke, too great a quantity of liquid have flowed over from one system to the other, then a correction is immediately made at the falling and rising operation, as then the surplus can flow back again from h to if, or vice versa, through the pipe 2'. Fig. 2 shows an embodiment fundamentally corresponding to Fig. 1. The difference principally consists in that the two receptacles of each pump are not directly connected with'each other. The two pipes g and g do'not-in this embodiment connect with the pipings 0 or 0 but with the receptacles (Z or al In this embodiment the branches a or at from the pipings a or a connect with the receptacles b and b 7 The pipes g and g must in this embodiment be U-formed, so that there will always be a liquid seal in each of the. pipes.

Another embodiment is shown in Fig. 3.

Here the small quantity of liquid flowing from one pump to another flows through the piping 1'. Each of the return pipes g and g is conducted back to the large receptacle of its own pump, as in the German patent 1 No. 226,548,. g terminates in 0 and g in 0 In this embodiment the apex of the piping 2' must lie a little lower than in the embodiment according to Fig. 1; The action of the pump is the same as in Figs. 1 and 2, and also like them, in that a small quantity of liquid at-the next stroke flows from one pump to another, and vice versa, so that always only one pump will be put into action. v r

The embodiment according to Fig. 2 can of course be constructed in such a manner that the two receptacles al and 03 will be separated from the receptacles b and b Claims. 1. A pumping device having pumps which work alternately and are provided with osof each pump connected with the corre-- sponding receptacle of another pump, by means of a return pipe, through which the small quantity of the pump liquid can overflow. I

4. In an embodiment as claimed in claim 3, the return pipes provided with liquid seals.

5. In an embodiment as claimed in claim 1, the arrangement of an overflow piping between the diflerent pumps.

' In testimony whereof I aflix my signature in presence of two witnesses.

NILS WENER.

Witnesses:

JACOB BAGGE, FRANK LYON. 

